/*
 * Copyright 2010 - Jeremie Brebec
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package org.jb.sharedbills.client.stores;

import org.jb.sharedbills.shared.model.Event;

public interface EventSaver {

	enum State {
		DIRTY,
		UPDATING,
		PARTIAL_COMMIT,
		COMMIT,
		ERROR, 
		LOCKED
	}
	
	/**
	 * 
	 * @author jeremie
	 *
	 */
	public interface SaveStateListener {
		
		/**
		 * 
		 * @param state
		 */
		void onStateChange( State state );
	}
	
	/**
	 * 
	 * @return
	 */
	State getState();
	
	/**
	 * 
	 * @param event
	 */
	void register( Event event, boolean isWriteable );
	
	/**
	 * 
	 * @param listener
	 */
	void addListener( SaveStateListener listener );
	
	/**
	 * 
	 * @param listener
	 */
	void removeListener( SaveStateListener listener );
}
